Vitamin A Nutrition Quiz
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Questions and Answers

What is the recommended dietary allowance (RDA) of Vitamin A for men?

  • 600 µg RAE/d
  • 700 µg RAE/d (correct)
  • 500 µg RAE/d
  • 800 µg RAE/d

    • Which form of Vitamin A is mainly stored in the liver and adipose tissue?

  • Retinol (correct)
  • Alcohol form
  • Aldehyde form
  • Acid form

    • What is the biological activity of β-carotene compared to retinol activity equivalent (RAE)?

  • ~ 30µg = 1µg retinol/RAE
  • ~ 12µg = 1µg retinol/RAE (correct)
  • ~ 6µg = 1µg retinol/RAE
  • ~ 24µg = 1µg retinol/RAE

    • What is the main function of Vitamin A in the body?

    <p>Vision</p> Signup and view all the answers

    What is the RAE of Vitamin A for lactating females?

    <p>950 µg/d</p> Signup and view all the answers

    What is the efficiency of retinol absorption compared to carotene?

    <p>70-90%</p> Signup and view all the answers

    Which food item provides the highest amount of Vitamin A per serving?

    <p>Beef liver, pan fried, 3 ounces</p> Signup and view all the answers

    What is the primary source of Vitamin A for the body?

    <p>Carotenoids</p> Signup and view all the answers

    What is the RAE of Vitamin A for males aged 11-14?

    <p>600 µg/d</p> Signup and view all the answers

    What is the main metabolic function of Vitamin A?

    <p>Participates in the conversion of light into nerve impulses</p> Signup and view all the answers

    What is the efficiency of carotene absorption compared to retinol?

    <p>5-60%</p> Signup and view all the answers

    What is the main cause of Vitamin A deficiency?

    <p>Poor absorption</p> Signup and view all the answers

    Which of the following is a symptom of vitamin A deficiency?

    <p>Impaired production of rhodopsin</p> Signup and view all the answers

    What is the function of retinoic acid in gene expression?

    <p>Regulates the expression of structural proteins</p> Signup and view all the answers

    Which of the following is a measure of vitamin A status?

    <p>Dark adaptation time</p> Signup and view all the answers

    What is a potential consequence of vitamin A toxicity?

    <p>Liver and bone damage</p> Signup and view all the answers

    Which receptors bind to the retinoic acid response element (RARE) on DNA?

    <p>$\alpha,\beta,\gamma$ retinoic acid receptor (RAR)</p> Signup and view all the answers

    What is the direct measure of vitamin A status?

    <p>Liver biopsy</p> Signup and view all the answers

    What is the main function of retinoic acid in epithelial cells?

    <p>Cell differentiation</p> Signup and view all the answers

    What is the role of carotenoids in the body?

    <p>Function as antioxidants</p> Signup and view all the answers

    What is the recommended upper limit of dietary intake for vitamin A in pregnant women?

    <p>3000-3300 µg</p> Signup and view all the answers

    What is the measure used to assess vitamin A status after vitamin A ingestion?

    <p>Relative Dose Response test</p> Signup and view all the answers

    What is a potential consequence of vitamin A deficiency?

    <p>Xerophthalmia</p> Signup and view all the answers

    What is the role of vitamin A in embryonic development?

    <p>Cell differentiation</p> Signup and view all the answers

    What is the main function of retinoic acid in gene expression?

    <p>Activates transcription</p> Signup and view all the answers

    Which receptors bind to the retinoic acid response element (RARE) on DNA?

    <p>$\alpha,\beta,\gamma$ retinoic X receptor (RXR)</p> Signup and view all the answers

    What is the measure used to assess vitamin A status after vitamin A ingestion?

    <p>Relative Dose Response test</p> Signup and view all the answers

    What is the direct measure of vitamin A status?

    <p>Liver biopsy</p> Signup and view all the answers

    What is a potential consequence of vitamin A toxicity?

    <p>Liver and bone damage</p> Signup and view all the answers

    What is the main cause of Vitamin A deficiency?

    <p>Inadequate dietary intake</p> Signup and view all the answers

    What is the role of carotenoids in the body?

    <p>Function as antioxidants</p> Signup and view all the answers

    What is the main metabolic function of Vitamin A?

    <p>Regulates gene expression</p> Signup and view all the answers

    What is the main function of Vitamin A in the body?

    <p>Vision</p> Signup and view all the answers

    What is the primary source of Vitamin A for the body?

    <p>Fruits and vegetables</p> Signup and view all the answers

    What is the efficiency of retinol absorption compared to carotene?

    <p>Higher</p> Signup and view all the answers

    What is the efficiency of carotene absorption compared to retinol?

    <p>Lower</p> Signup and view all the answers

    What is the retinol activity equivalent (RAE) for 1µg of β-carotene?

    <p>12µg</p> Signup and view all the answers

    What is the primary form of Vitamin A stored in the liver and adipose tissue?

    <p>Retinol</p> Signup and view all the answers

    What is the recommended dietary allowance (RDA) of Vitamin A for women?

    <p>600 µg</p> Signup and view all the answers

    What is the main metabolic function of Vitamin A?

    <p>Participates in the conversion of light into nerve impulses</p> Signup and view all the answers

    What is the measure used to assess vitamin A status after vitamin A ingestion?

    <p>Retinol Binding Protein</p> Signup and view all the answers

    What is the efficiency of retinol absorption compared to carotene?

    <p>70-90%</p> Signup and view all the answers

    What is the RAE of Vitamin A for males aged 18-64?

    <p>900 µg</p> Signup and view all the answers

    What is a potential consequence of vitamin A deficiency?

    <p>Night blindness</p> Signup and view all the answers

    What is the efficiency of carotene absorption compared to retinol?

    <p>Lower</p> Signup and view all the answers

    What is the main function of retinoic acid in gene expression?

    <p>Regulates the expression of target genes</p> Signup and view all the answers

    Which food item provides the highest amount of Vitamin A per serving?

    <p>Beef liver, pan fried, 3 ounces</p> Signup and view all the answers

    What is the biological activity of β-carotene compared to retinol activity equivalent (RAE)?

    <p>Lower</p> Signup and view all the answers

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